/* roulang page: index */
:root {
      --charcoal: #1A1A1A;
      --champagne: #C8A96E;
      --champagne-dark: #B8944E;
      --off-white: #F5F3EF;
      --deep-gray: #2C2C2C;
      --mid-gray: #6B6B6B;
      --pale-gold: #EBE3D3;
      --text-body: #4A4A4A;
      --font-heading: 'Cormorant Garamond', 'Noto Serif SC', serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --container-max: 1280px;
      --section-gap: 120px;
      --card-gap: 24px;
      --radius: 6px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 24px rgba(0,0,0,0.08);
      --transition-base: 250ms ease;
      --transition-card: 400ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--charcoal);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
      outline: none;
      transition: all var(--transition-base);
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      :root {
        --section-gap: 80px;
      }
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 300ms ease, backdrop-filter 300ms ease;
      background: transparent;
    }
    .site-header.scrolled {
      background: rgba(44, 44, 44, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 80px;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 2px;
      color: var(--champagne);
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-menu a {
      font-size: 14px;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--off-white);
      position: relative;
      padding-bottom: 4px;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 1px;
      background: var(--champagne);
      transition: width 200ms ease;
    }
    .nav-menu a:hover {
      color: var(--champagne);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--champagne);
      color: var(--charcoal) !important;
      padding: 12px 24px;
      border-radius: var(--radius);
      font-weight: 600;
      letter-spacing: 0.5px;
      text-transform: none !important;
      transition: background var(--transition-base);
    }
    .nav-cta:hover {
      background: var(--champagne-dark);
      color: var(--charcoal) !important;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 8px;
      z-index: 1001;
    }
    .hamburger span {
      display: block;
      width: 26px;
      height: 2px;
      background: var(--champagne);
      transition: 300ms;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(28, 28, 28, 0.98);
      backdrop-filter: blur(16px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 999;
      opacity: 0;
      pointer-events: none;
      transition: opacity 300ms ease;
    }
    .mobile-menu.active {
      display: flex;
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-menu a {
      font-size: 22px;
      font-weight: 500;
      color: var(--off-white);
      letter-spacing: 1px;
    }
    .mobile-menu .nav-cta {
      margin-top: 20px;
      font-size: 18px;
      padding: 16px 40px;
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
    }
    /* Hero */
    .hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: var(--charcoal);
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(26,26,26,0.65);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
    }
    .hero-text {
      flex: 1;
      max-width: 600px;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--off-white);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 16px;
      color: var(--mid-gray);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .hero-btn {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: var(--champagne);
      color: var(--charcoal);
      font-weight: 600;
      padding: 16px 36px;
      border-radius: var(--radius);
      font-size: 16px;
      transition: background var(--transition-base), gap var(--transition-base);
    }
    .hero-btn i {
      transition: transform var(--transition-base);
    }
    .hero-btn:hover {
      background: var(--champagne-dark);
      gap: 16px;
    }
    .hero-badge {
      position: absolute;
      right: 40px;
      bottom: 60px;
      background: rgba(44,44,44,0.7);
      backdrop-filter: blur(8px);
      padding: 16px 28px;
      border-radius: var(--radius);
      border-left: 3px solid var(--champagne);
      color: var(--off-white);
      font-family: var(--font-heading);
      font-size: 28px;
      font-weight: 700;
      z-index: 2;
    }
    .hero-badge span {
      color: var(--champagne);
    }
    @media (max-width: 1024px) {
      .hero h1 { font-size: 40px; }
      .hero-badge { font-size: 22px; padding: 10px 20px; right: 20px; }
    }
    @media (max-width: 768px) {
      .hero-content { flex-direction: column; text-align: center; }
      .hero-text { max-width: 100%; }
      .hero h1 { font-size: 32px; }
      .hero-badge { position: static; margin-top: 30px; display: inline-block; }
    }
    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
      background: var(--off-white);
    }
    section.dark-bg {
      background: var(--deep-gray);
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: 36px;
      line-height: 1.3;
      font-weight: 600;
      color: var(--charcoal);
      margin-bottom: 16px;
    }
    .dark-bg .section-title {
      color: var(--off-white);
    }
    .section-desc {
      font-size: 16px;
      color: var(--mid-gray);
      max-width: 600px;
      margin-bottom: 48px;
    }
    /* 优势数据 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 0;
      border-top: 1px solid var(--pale-gold);
      border-bottom: 1px solid var(--pale-gold);
      padding: 40px 0;
      margin-top: 40px;
    }
    .adv-item {
      text-align: center;
      padding: 20px;
      position: relative;
    }
    .adv-item:not(:last-child)::after {
      content: '';
      position: absolute;
      right: 0;
      top: 20%;
      height: 60%;
      width: 1px;
      background: var(--mid-gray);
    }
    .adv-number {
      font-family: var(--font-heading);
      font-size: 48px;
      font-weight: 700;
      color: var(--champagne);
      line-height: 1;
    }
    .adv-label {
      font-size: 14px;
      color: var(--text-body);
      margin-top: 8px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    @media (max-width: 768px) {
      .advantage-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
      }
      .adv-item::after { display: none; }
    }
    /* 服务板块 非对称 */
    .service-asymmetric {
      display: flex;
      gap: 60px;
      align-items: flex-start;
    }
    .service-left {
      flex: 1;
    }
    .service-right {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 32px;
      padding-top: 40px;
    }
    .service-card {
      background: var(--off-white);
      border: 1px solid var(--pale-gold);
      border-radius: var(--radius);
      padding: 32px;
      transition: var(--transition-card);
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--champagne);
      background: #fffcf7;
    }
    .service-icon {
      font-size: 28px;
      color: var(--champagne);
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--charcoal);
      margin-bottom: 8px;
    }
    .service-card p {
      color: var(--text-body);
      font-size: 15px;
      line-height: 1.5;
    }
    @media (max-width: 768px) {
      .service-asymmetric {
        flex-direction: column;
        gap: 32px;
      }
      .service-right { padding-top: 0; }
    }
    /* 案例墙 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--card-gap);
    }
    .case-card {
      position: relative;
      border-radius: var(--radius);
      overflow: hidden;
      aspect-ratio: 4/3;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-card);
    }
    .case-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 400ms ease;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(26,26,26,0.7);
      backdrop-filter: blur(4px);
      padding: 16px;
      color: var(--off-white);
      transition: background 300ms;
    }
    .case-card:hover .case-overlay {
      background: rgba(200,169,110,0.8);
    }
    .case-title {
      font-weight: 600;
      font-size: 16px;
    }
    .case-location {
      font-size: 13px;
      opacity: 0.8;
    }
    @media (max-width: 768px) {
      .case-grid { grid-template-columns: 1fr; }
    }
    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 0;
      border-top: 1px solid var(--pale-gold);
    }
    .faq-item {
      border-bottom: 1px solid var(--pale-gold);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      font-weight: 600;
      color: var(--charcoal);
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--champagne);
      transition: transform 300ms;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      font-size: 15px;
      color: var(--text-body);
      padding-right: 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* CTA */
    .cta-section {
      background: var(--deep-gray);
      text-align: center;
      padding: 100px 0;
    }
    .cta-title {
      font-family: var(--font-heading);
      font-size: 36px;
      color: var(--off-white);
      margin-bottom: 24px;
    }
    .cta-btn {
      background: var(--champagne);
      color: var(--charcoal);
      padding: 18px 48px;
      border-radius: var(--radius);
      font-weight: 600;
      font-size: 18px;
      display: inline-block;
      margin-bottom: 16px;
    }
    .cta-btn:hover {
      background: var(--champagne-dark);
    }
    .cta-note {
      color: var(--mid-gray);
      font-size: 14px;
    }
    /* 页脚 */
    .site-footer {
      background: #2C2C2C;
      padding: 60px 0 30px;
      color: var(--mid-gray);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-family: var(--font-heading);
      font-size: 22px;
      color: var(--champagne);
      font-weight: 700;
    }
    .footer-desc {
      margin-top: 12px;
      font-size: 14px;
      line-height: 1.6;
    }
    .footer-col h4 {
      color: var(--off-white);
      font-weight: 600;
      margin-bottom: 16px;
      font-size: 15px;
    }
    .footer-col a {
      display: block;
      font-size: 14px;
      margin-bottom: 10px;
      color: var(--mid-gray);
    }
    .footer-col a:hover {
      color: var(--champagne);
    }
    .copyright {
      border-top: 1px solid #4A4A4A;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .counter-animate {
      display: inline-block;
    }